From love to jealousy ...

King Saul, who greatly loved David (1 Sam. 16:21),

became jealous of David when the women sang upon his return after slaying Goliath,

"Saul has slain his thousands, and David his tens of thousands" (1 Sam. 18:6-9).

However, because God was with David, and he acted wisely in all his ways,

King Saul, consumed by fear, became David's lifelong adversary,

even attempting to kill him on multiple occasions (vv. 18:12-15, 25, 28).